Пусть дан параллелограмм авсd и его диагональ ас. полный угол а равен сумме меньших углов, из которых он состоит, т.е. ваd = вас + dас = 40 + 20 = 60 градусов. теперь рассмотрим сам параллелограмм. сторона ав является секущей по отношению к пареллельным прям вс и аd (противолежащие стороны параллелограмма параллельны друг другу). по теореме о углах, образованный при пересечении параллельных прямых секущей, сумма односторонних углов, коими являются углы авс и ваd, равна 180 градусам, т.е. авс + ваd = 180. авс = 180 - ваd = 180 - 60 = 120 градусов. больший угол параллелограмма авс равен 180 градусам.
І love Holiday fairs because i can buy many interesting things cheap. Autumn festival is very ineresting day , you can dance or sing with people . Concers on holiday days I love hanging out with my friends. Competitions in running always boring. Singing folk songs or chastuhras always forces me think about past people. Perfomances of the city folk always interesting because you can sea people with different talents. If me asked what is the best kind of dance , I will answer folk dance. On pet shows you can sea very beatiful pets. On flower shows you can sea flowers about what you never know
Autumn festival is very ineresting day , you can dance or sing with people .
Concers on holiday days I love hanging out with my friends.
Competitions in running always boring.
Singing folk songs or chastuhras always forces me think about past people.
Perfomances of the city folk always interesting because you can sea people with different talents.
If me asked what is the best kind of dance , I will answer folk dance.
On pet shows you can sea very beatiful pets.
On flower shows you can sea flowers about what you never know